Everyone does it, but why? In this episode of SciShow Quick Questions you get the answers!

Hosted by: Michael Aranda
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Sources:http://www.ncbi.nlm.nih.gov/pubmed/22...

http://news.nationalgeographic.com/ne...

http://www.everydayhealth.com/allergy...

http://www.huffingtonpost.com/2014/03...

http://www.scientificamerican.com/art...

http://www.popsci.com/why-do-most-peo...

http://scienceline.org/2008/01/ask-ha...

http://www.smithsonianmag.com/smithso...